Bug ID 484948: UDP connflow may aborted from parked iRule in server_closed.

Last Modified: Oct 16, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.4.1, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.0 HF4, 11.4.1 HF10

Opened: Oct 16, 2014

Severity: 2-Critical

Related Article: K16732

Symptoms

Some UDP idle flows will abort a parked iRule after the UDP idle timeout.

Impact

The impact of this issue is the iRule aborts and impacts performance. The user cannot keep accurate connection count per client using iRules.

Conditions

Conditions leading to this issue include: 1) UDP virtual, drop connection on response. 2) client_closed and server_close iRule, and parked in irule for a long time 3) make the the virtual expired when iRule is parking.

Workaround

Set the idle timeout to a different value in client and sever will make it happen much less frequently.

Fix Information

Resolve problem of double calling functions that caused iRule to abort.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips